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僧帽瓣 疾患의 直視下 手術 : 6 Case reports
金奎煥,徐相賢,洪承祿,李世淳,洪弼勳,李圭植 최신의학사 1968 最新醫學 Vol.11 No.4
This report consists of six cases with mitral valvular diseases who were operated on by open cardiac repairs under cardiopulmonary by-pass. The post operative results were excellent in four cases with normal exercise tolerance and fair or no symptomatic improvement noted in the remaining two cases, without operative mortality. As to the failure of symptomatic improvement following surgery in the latter two cases the main cause was considered as persistent tricuspid insufficiency which was not corrected even though the mitral valvular lesion was repaired successfully. Since the left atrial thrombosis is frequently associated with atrial fibrillation statistically in cases of mitral stenosis the closed method of mitral commissurotomy with pump stand-by is thought to be. desirable. In one case with the left atrial myxoma who brought some difficulty in the differential diagnosis of mitral stenosis or mitral insufficiency preoperatively the definite diagnosis could be made only by finger exploration an the table and the tumor was removed by open heart under cardiopulmonary bypass successfully with dramatic symptomatic improvement. We again impressed that whenever the signs and symptoms of mitral stenosis is bizarre and E.K.G. or cardiac catheterization findings are not well corelated with the clinical signs the possibility of diagnosis for left j atrial myxoma should always be ruled out.
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金圭煥 군산대학교 1982 群山水産專門大學 硏究報告 Vol.16 No.3
In order to design the simple and economic Band-Pass Active filter, 2nd-order BPF using OP-amplifier were studied by their experiments. The results were obtained as follows. 1.2nd-order BPF Transfer function could be realized and the unity between calculated value and measured vague of the gain were comformed by experiments. 2.The transfer function of LPF and HPF could be realized by changing some elements of the BPF circuits. 3.The circuit was comparatively simple and the dumping characteristic of the frequency was good.
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김규환 群山大學校 1995 論文集 Vol.22 No.-
Recently, the demand of switched capacitor filter(SCF) has been increased as the circuits of currents communication equipment systems. But, the most of SCF has been built in complex circuits having many resistors, capacitors and switches. There are problems to reduce the cost and the number of elements, also to make the monolithic IC easily. In this paper, a design method of 2nd order Band Pass SCF using only one op-amplifier are presented. The equivalent monolithic IC of this SCF could be made simply and easily be-cause the circuits is built by only one op-amplifier, capacitors and switches. Also, it shows that frequency characteristic response of designed SCF by experiment were almost similar to the theoretical values.
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김규환 군산대학교 1986 群山水産專門大學 硏究報告 Vol.20 No.3
Recently, the demand of A/D converter has been increased as an I/O of analog data communication systems and digital measuring instruments. But as the most of A/D converter was built in complex circuit having many resisters, capacitors and switches, there were problems to reduce the cost and the number of required elements. In this paper, the operation and conversion character of a dual-slope integrator A/D converter designed by using switched capacitor were studied analytically and its error voltages were studied experimentally. 1. The conversion of high accuracy with linearity could be realized since it was conformed that the experimental values of error voltages were less than 1/2 LSB. 2. This circuit would be convenient for MOS analog LSI since it was built only by the elements of IC and condenser. 3. This circuit should be suited for the digital counter of voltage and current because of its a good linearity.
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김규환,옥승철,이영민,임대건,이상혁,설상영,정정명,최하진 인제대학교 1995 仁濟醫學 Vol.16 No.2
대장 흑피증은 매우 드문 질환으로 anthraquinone 제제의 지속적인 복용과 관련되어 있다고 알려져 있는데 저자 등은 본원에서 대장 내시경을 통한 조직검사나 수술을 통해 확진된 대장 흑피증 환자 5명을 대상으로 그 임상적 특징을 관찰하고 문헌 고찰과 함께 보고하는 바이다. Melanosis coli is the brownish black pigmentation of the colon associated with prolonged ingestion of anthraquinone compounds as laxatives. This condition is so rare that a few cases have been reported in Korea and its pathophysiology has not been understood clearly Many studies have suggested that the brownish discoloration of the colon mucosa is due to accumulation of macrophage containing lipofuscin pigment. We report 5 cases of melanosis coli histologically confirmed by colonoscopic biopsy or by operation from January, 1992 to September, 1994 in this hospital with a review of the literature.
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R&D협업 기관들의 공간적 분포와 지역 간 네트워크 분석 -정보통신, 바이오, 에너지 산업을 중심으로-
김규환 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.5
국가균형발전을 위한 지역혁신이 주목받아 왔다 그 이유는 지역 특화산업의 R&D역량을 향상시킴으로써 지역이 내생적으로 성장할 수 있기 때문이다. 그러나 지역혁신에 대한 지속적인 논의에도 불구하고, 실질적으로 지역에서 R&D협업이 어떻게 이루어지는지에 대한 실증적인 분석이 부족하다. 따라서 본 연구는 정보통신, 바이오, 에너지 산업을 중심으로 국가 R&D사업에 참여한 기관들이 어느 지역에 밀집해 있는지 분석하였다. 그리고 개별 기업들을 주소로 라벨링하여 어느 지역이 R&D협업 네트워크에서 높은 영향력을 갖는지 분석하였다. 분석결과 정보통신 R&D사업에 참여한 대부분의 기관들은 수도권에 밀집해 있었다. 네트워크 분석에서도 성남시와 강남구의 연결 중심도 값이 높게 나타났다. 바이오와 에너지 R&D사업은 수도권뿐만 아니라 충청권, 동남권에도 관련 기관들이 밀집해 있는 것으로 나타났으며, 네트워크 관계에서도 중요한 지역으로 나타났다. 하지만, 정보통신은 바이오, 에너지, 자동차 등 많은 산업에서 활용되는 기술이다. 따라서 지역혁신을 구축할 때, 지역 내부자원의 이용뿐만 아니라 지역 외부자원을 내부자원과 함께 어떻게 활용할 것인지에 대한전략이 필요하다.
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L.Kohlberg 도덕교육론의 전ㆍ후기 관점 비교 : 'moral dilemma discussion approach' and 'just community approach'
김규환 仁川敎育大學校 1996 論文集 Vol.29 No.2
Through this study I divided Kohlberg's moral education into early perspective(moral dilemma discussion approach) and later perspective(just community approach). And I examined what is each pespective's educational principles and what is major difference between them. Many existing studies mainly have discussed on the Kohlberg's early perspective, and relatively there are few research about his later perspective. As results of this study, I found that there are four methodological differences(① contents, ② methods, ③ relations between moral thinking and moral behavior, ④ roles of teacher) between early and later perspectives of Kohlberg's moral education. Besides these differences, each perspectives have different understandings about morality and aims of moral education. In spite of these facts, it is necessary to notice that Kohlberg's early and later perspectives, on the one hand, are not exclusive relations but mutual supplementary relations, on the other hand, represent different truths about phenomenon of morality.
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